Oil pump



Aug. 10 1926.

N. A. CHRISTENSEN OIL PUMP Filed May '7, 1924 m Rw 0 mm E 5 V/ WW L m M ,A v'jg'ageat'ilel in a groove 13l in the' shaft 7 Patented Augl.i,10 ,'1926l. g

UNITI-:D sinerijs 1,595,381 PATENT OFFICE.

' vIBTIIEIIAS CHRISTENSEN, OF MILWAUKEE, WISCONSIN.

OIL PUMP.

Application -nled ltay 7,'

* 16 and 17 lead from-said inlelr to the pump- The invention relates t oil pumps.'

. In some situations where a unit is added to an existing machine said unit is provide with its ownA oiling system which is driven from theexisting machine. This is particularly true of `an automotive power plant and a compressor which is designed as an adjunct to saidplantsa'nd driyen thereby to n supply compressed air for-the starting and 107 braking system of the vehicle, and it fren quently happens that the motors of such power'` plants do not run in the same direction so that to provide an oiling system for theV compressor the oil pump must' be capable of running in either direction. The object ofthis -invention is to provide an oil pump which runs in either direction without any necessity for adjustment. The invention further consists in the several features hereinafter set, forthand more clusion hereof.'

` AIn the drawings: Fig. 1 is an end lelevation view of an oil pump embodying the in.v

- Fig. 2 is a sectional view take-non -'the line 2-2 of Fig. 1;

Fig. 3 isa detail sectional view taken on the'line 3-3 of Fig. 2; Fig. 4 is a detail sectional view taken along the line 4-4 of Fig. 2; Fig. 5 is a detail sectional view taken -along the line 5-5 of Fig. 1. In the drawings the numeral 6 designates a shaft-bearing end plate for a mechanism, such as a compressor, whose s aft 7 is driven by the engine with which said compressor yis to be associated.

As shown, the oil pump embodying the in vention is mounted "on the end plate and driven from the shaft 7, butv other driving arrangements may be used -without depart; ing from the novel features of the invention hereinafter described.-

The oil pump shown is vof the gear type,

including a casing 8 having a chamber in,

which the interrneshing pump gears 9 and 10 work. The gear 9 is provided with a ,shaft 11 having ay tongue-12 at its end-enwhereby it isv driven. l

"""llheY casing-` 1-'is provided with an inlet 14 pted to be connected with a supply of atingpil byga pipe 15, or tp receive o er suitable manner, and ducts particularly definedI by claims at4 the con- 1924. serial No. 711,664.

chamber.

Casing is preferably made in two parts;. Y a main body portion 18- and anend plate 19`secured to the` body by screws20 and ina leak-tight manner. -transverse passage 21 formed 'therein and closed olf at its ends by screw plugs 22, and delivery ducts 23 and 24 establish communication between the spaces 25 and 26 of the The end plate 19 has a pump chamber and said passage 21, while a f passage 27, closedd at its outer end by a plug 27 commlmicates with the passage 21 and with .a deliverv duct 28 which is alined with a delivery duct 29, preferablyformed in the. shaft 11 of the pump. A hall 30 fits quite therefore, the direction'of the delivery of the pump. -This action takes place automatically the moment the pump is started'. In the construction herein shown, where the gear 9 is rotating in a clockwise direction, when viewed from the front, the oil4 issqueezed down through the passage 24 and forces the ball through the passageandover against the stop formed by the screw 22 at the opposite end, which actsto vcover the port 23 and establish a flow of oil through passage 21, passage 27, ducts'28 and 29 into Aa space 31 at the end of the shaft 7 from which -it passes through aslot 32 in the bearing 33 to a duct 34 leading to the lubricating system of the machine. -On a reverse rotation of thev gear 9 the ball will close off port 24 and the oil will pass through port 23, passages 21 and 27 to the ducts 28 and 29. Thus, the pressure of the. oil in the pump automatically shifts the ball 30 sok that theump will deliver oil in either-direction of) rotation so that no special mechanism'has to be provided to accommodate for the particular direction of rotation of the device with which the pump is associated.

The pump casing 18 has a flanged end 35 having a snug fit with'the end plate and secured thereto by screws 36. I desire it to be understood 'that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are specified in the claims.

What I claim as my invention is: l. In an oil pump, the combination with a chamber and apair of rotary pumping members disposed therein, Jof delivery ducts -leading from said chamber. a common delivery passage for said' ducts` and a ball sliiftable in said passage, for automatically closing one of said delivery ducts When lsaid members are revolving in one direction and closing the other duct when said members are revolving in the opposite direction.

2. In an oil pump, the combination with a pump chamber and a pair of intermeshing pump gears mounted therein, of passages adjacent the intermeshing portion of said gears, a common passage in communication with said'passages, a shiftablemember in said common passage for closing either one of said delivery passages, depending upon the direction of rotation lof said gears, and a duct through one of said gears communicating with said delivery duct.

3. The combination With a drive shaft, of an oil pump having la pump chamber, a pair of intermeshing `pumping gears in said chamber, one ofvsaid gears having a shaft drivingly connected with said first-named shaft,a pair vof delivery nducts from the pump chamber communicating with a common delivery duct, a duct through saiid pump gear shaft communicating with said commnn'V delivery ductgand a bally iny saidY common delivery duct shiftable toclose 35 either of the delivery ducts from the pump chamber,'the position of said ball dpending\ .upon the direction of rotation of said shaft.

In r`testimony whereof, l aflix my signature. Y.

NIELs A. CHRISTENSEN. 

